Editing of the append of table & was canceled

What causes this issue?

Editing of the <DS:TX.APPEND-STRUKTUR>append</> was terminated without
it having been created in the ABAP Dictionary.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Ensure that all required <DS:TX.DOKU_RADTBFDS_KUNDENFELD>customer
fields</> in the table lie in appends or <DS:TX.KUNDEN-INCLUDE>customer
includes</> for the table.

Error message extract from SAP system. Copyright SAP SE.